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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Earnings Per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Basic and diluted earnings per common share |  |  |  |  |  |  |  |  |
Net income | $ 82,416 |  |  | $ 100,950 |  |  | $ 253,593 | $ 289,994 |
Net income attributable to noncontrolling interests in the Operating Partnership | (396) |  |  | (551) |  |  | (1,250) | (1,616) |
Net loss attributable to noncontrolling interests in subsidiaries | 910 |  |  | 398 |  |  | 2,744 | 910 |
NET INCOME ATTRIBUTABLE TO THE COMPANY | $ 82,930 |  |  | $ 100,797 |  |  | $ 255,087 | $ 289,288 |
Weighted average basic shares outstanding (in shares) | 228,791,000 |  |  | 226,166,000 |  |  | 228,731,000 | 225,941,000 |
Share options and restricted share units (in shares) | 504,000 |  |  | 983,000 |  |  | 506,000 | 864,000 |
Weighted-average diluted shares outstanding (in shares) | 229,295,000 |  |  | 227,149,000 |  |  | 229,237,000 | 226,805,000 |
Basic earnings per share attributable to common shareholders (in dollars per share) | $ 0.36 |  |  | $ 0.45 |  |  | $ 1.12 | $ 1.28 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | 0.36 |  |  | 0.44 |  |  | 1.11 | 1.28 |
Dividends declared per common share (in dollars per share) | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.51 | $ 0.51 | $ 0.51 | $ 1.56 | $ 1.53 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |  |  |
Weighted average basic shares outstanding (in shares) | 228,791,000 |  |  | 226,166,000 |  |  | 228,731,000 | 225,941,000 |
Share options and restricted share units (in shares) | 504,000 |  |  | 983,000 |  |  | 506,000 | 864,000 |
Weighted-average diluted shares outstanding (in shares) | 229,295,000 |  |  | 227,149,000 |  |  | 229,237,000 | 226,805,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.36 |  |  | $ 0.44 |  |  | $ 1.11 | $ 1.28 |
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 1,400,000 |  |  |  |  |  | 1,400,000 | 700,000 |
Dividends declared per common share (in dollars per share) | $ 0.52 | 0.52 | 0.52 | $ 0.51 | 0.51 | 0.51 | $ 1.56 | $ 1.53 |
Operating Partnership [Member] |  |  |  |  |  |  |  |  |
Basic and diluted earnings per common unit |  |  |  |  |  |  |  |  |
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 1,100,000 |  |  | 1,200,000 |  |  | 1,100,000 | 1,300,000 |
CubeSmart, L.P. and Subsidiaries |  |  |  |  |  |  |  |  |
Basic and diluted earnings per common share |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | $ 253,593 | $ 289,994 |
Weighted average basic shares outstanding (in shares) | 229,894,000 |  |  | 227,403,000 |  |  | 229,860,000 | 227,203,000 |
Share options and restricted share units (in shares) | 504,000 |  |  | 983,000 |  |  | 506,000 | 864,000 |
Weighted-average diluted shares outstanding (in shares) | 230,398,000 |  |  | 228,386,000 |  |  | 230,366,000 | 228,067,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.36 |  |  | $ 0.44 |  |  | $ 1.11 | $ 1.28 |
Dividends declared per common share (in dollars per share) | $ 0.52 |  |  | $ 0.51 |  |  | $ 1.56 | $ 1.53 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |  |  |
Net Income | $ 82,416 |  |  | $ 100,950 |  |  | $ 253,593 | $ 289,994 |
Net loss attributable to noncontrolling interests in subsidiaries | 910 |  |  | 398 |  |  | 2,744 | 910 |
Net income attributable to CubeSmart L.P. | $ 83,326 |  |  | $ 101,348 |  |  | $ 256,337 | $ 290,904 |
Weighted average basic shares outstanding (in shares) | 229,894,000 |  |  | 227,403,000 |  |  | 229,860,000 | 227,203,000 |
Share options and restricted share units (in shares) | 504,000 |  |  | 983,000 |  |  | 506,000 | 864,000 |
Weighted-average diluted shares outstanding (in shares) | 230,398,000 |  |  | 228,386,000 |  |  | 230,366,000 | 228,067,000 |
Basic earnings per unit attributable to common unitholders (in dollars per share) | $ 0.36 |  |  | $ 0.45 |  |  | $ 1.12 | $ 1.28 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | 0.36 |  |  | 0.44 |  |  | 1.11 | 1.28 |
Dividends declared per common unit (in dollars per unit) | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.51 | $ 0.51 | $ 0.51 | $ 0.52 | $ 0.51 |
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 1,400,000 |  |  | 700,000 |  |  | 1,400,000 | 700,000 |
Dividends declared per common share (in dollars per share) | $ 0.52 |  |  | $ 0.51 |  |  | $ 1.56 | $ 1.53 |
Outstanding units of noncontrolling interest in the Operating Partnership (in shares) | 1,103,240 |  |  | 1,232,205 |  |  | 1,103,240 | 1,232,205 | 1,194,705

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